Improvement in striking mechanisms for door-bells



W. E. SPARKS. Striking Mechanism for Door-Bells.

No. 223,074. Patented Dec. 30, 1879.

UNITED STATES PATENT OFFICE.

WILLIAM E. SPARKS, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO I 85 F.GORBIN, OF SAME PLACE.

IMPROVEMENT IN STRIKING MECHANISMS FOR DOOR-BELLS.

Specification forming part of Letters Patent No. 223,074, dated December30, 1879 application filed July 29, 1879.

To all whom it may concern Be it known that I, WILLIAM E. SPARKS, of NewBritain, in the county of Hartford and State of Connecticut, haveinvented certain new and useful Improvements in Bell-Strikin'gMechanisms, of which the following is a specification.

My invention has for its object clleapness of production by so formingthe parts that after the castings are obtained they may be readily puttogether with but little if any fitting and without any drilling orriveting, and also to produce a double stroke with a less number ofparts than has heretofore been employed; and the invention consists inthe peculiar construction of certain parts, and in their combination, ashereinafter more fully described.

In the accompanying drawings, Figure 1 is a front elevation of abell-striking mechanism which embodies my invention, and Fig. 2 is asectional view of the same on line m 00 of Fig. 1.

The manner of hanging the hammer to the base-plate is in the nature ofan improvement upon one of my prior inventions described and claimed inanother application of even date herewith, and nothing shown ordescribed in said application is intended to be claimed in this one. I

The base-plate A is formed with a pivotal stud, a, on it, and with twohooked arms, I) I), upon opposite sides of said'stud. For convenience ofcasting these hooked arms I) b,-I form two openings in the base-plateunder the hooked part of said arms, as indicated by broken lines in Fig.1, whereby the same may be cast without coring. I form a hole or hearingin the hammer-tail B to receive the pivotal stud a, and surrounding saidbearing I form a broad disk'shaped base, 0, provided with notches on twoopposite sides, as shown. The notches in the disk and the arms I) b onthe plate are so located that when the hammer is swung inward toward thecentral post, 0, to its full extent they will coincide, and in thatposition the hammer may be slipped upon or off from the pivotal stud a;but when, under the influence of the spring D, the hammer is swung intoposition for use, as shown in Fig. 1, the edges of the disk-shapedordinary stop 01 is employed to limit its movement.

The striking mechanism is designed to be operated by a lever, E, hungupon the opposite side of the door, as in ordinary door-bells; but itmay be operated by a pull and wire attached to the lever which rides onthe face of the base'plate.

I form an opening, F, in the base'plate A, for the end of the lever E tooperate in, and one side of said opening I form on the arc of acircle,and with a narrow bridge, 0, which covers a narrow rabbet. The lever Gis mounted on a stud,f, on the base-plate, the opening it in said leverwhich receives said stud being elongated somewhat, as shown. A stop, 70,limits the downward movement of the long end of said lever; but saidstop maybe formed by the shoulder at the lower end of the opening behindthe bridge 0, in which case the end of the lever Gr, just outside theoffset m, will strike the stop formed by said shoulder, and limit thedownward movement of said lever precisely the same as does the stop It.One arm of the spring bears upon the lever G to constantly force itdownward. This end of the lever is also provided with an offset, m, (seeFig. 2,) which takes under the bridge 0, thereby preventing that end ofthe lever from coming forward out of place. A wing, n, on thehammer-tail projects over the other end of said lever, and holds thatend from coming forward out of place.

The short end of the lever G has a point, 0, which, when the parts areat rest, lies just above the point on the operative edge of thehammer-tail, as shown in Fig. 1. this position the pivotal stud f is atthe bottom of the slot or opening it.

By raising the end of lever E, or otherwise When in i lifting the longend of the lever G against the spring D, the lever oscillates as on afixed fulcrum, and the point 0 forces the hammer-tail -outward untilsaid point passes the highest point on the operative edge of thehammertail, which, under the influence of the spring D, immediatelyreturns to its former position, and in so doing the upper side of thepoint 0 is acted upon by the hammer-tail to throw it downward out of theway; otherwise the 11ammer-tail could not return quickly enough tostrike a blow. The slot or opening it in the lever G allows the end ofthe lever to move downward, and then the upper end of the slot it restsupon the upper side of the stud f, the lever being in position tooscillate as on a different center from before, as indicated by brokenlines in Fig. 1.

The arm of the spring D which bears upon the leverGis shorter than thearm which acts upon the hammer-tail, and also the leverage of G isgreater than that of the hammer-tail, whereby, when the parts are in theposition last described, and the long end of the lever G relieved fromupward pressure of the lever E, the spring acts to force the long end oflever G downward and the hammer-tail outward, and another stroke isimparted to the hammer, the short end of the lever G rising again intothe position represented by full lines, in order to get out of the wayof the hammertail. Thus it will be seen that adouble stroke is impartedto the hammer by a forward and backward movement of the lever G.

Although I have described the hammer-tail as pivoted and held inposition in a peculiar manner, it is evident that the lever G might besecured in place in the manner herein described independently of thefact of Whether or not the hammer is held in the peculiar manner shownand described. It is also evident that the double-stroke feature of thismechanism may he employed in a device having the lever secured in anyordinary manner, as by a head on its pivotal stud.

I am aware that a single spring in door-bells has acted both upon thehammer-tail and the mechanism which operated it; also, that doublestrokebells, consisting in part of a triangular trip on the end of a lever,are old; also, thatit is old to make a wing or projection on thehammer-tail extend over the mechanism for tripping it, to hold or assistin holding said mechanism in place, all of which prior devices arehereby disclaimed.

I'claim as my invention- 1. In a bell-striking mechanism, thehammer-tail B, provided with the broad disk-shaped base 0, notched ontwo opposite sides, in combination with the spring D, pivotal stud a,and base-plate A, having hooked arms I) I), located relatively to thenotches in said base, substantially as described, and for the purposespecified.

2. [n a bell-striking mechanism, the oscillating lever G, slottedtransversely at h, and hung on a stud of less diameter than the lengthof the slot, and capable of oscillation, as on different centers, incombination with the hammertail and spring, all combined and operatingsubstantially as described, and for the purpose specified.

3. In a bell-striking mechanism, the oscillating lever G, having oli'setm, in combination with the base-plate A, having bridge 6, and thehammer-tail, having the Wing at, all combined and operating together tohold the lever in place, substantially as described, and for the purposespecified.

WILLIAM E. SPARKS.

Witnesses:

Guns. F. OoRBIN, E. L. PRIOR.

